Light emitting diode (LED) lighting fixture having tool-less light engine module

Abstract

A light fixture is provided. The light fixture contains a light engine module having a printed circuit board with a plurality of light sources and a lens module having a plurality of lens elements for the plurality of light sources, a housing for the light engine module, and a latch engaged with the housing, the latch locking and unlocking the lens light engine module with the housing.

What is claimed is: 
     
       1. A light fixture comprising:
 a housing for accommodating a light engine module, the light engine module comprising a lens module having a plurality of lens elements mounted on a plurality of light sources of a light emitting diode (LED) engine; 
 a rotatable latch engaged with the housing, the latch locking and unlocking the light engine module with the housing by being engaged and disengaged with the light engine module, the latch rotating about an axis perpendicular to the plurality of lens elements of the light engine module; and 
 a mounting wedge fastened to the housing for aligning one end of the light engine module with a predetermined position of the housing and retaining the lens module to the LED engine when the latch is locked. 
 
     
     
       2. The light fixture according to  claim 1  wherein the mounting wedge is configured to clamp the light engine module from either side of the light engine module. 
     
     
       3. The light fixture according to  claim 1  wherein the mounting wedge provides an angular interface between the mounting wedge and the light engine module. 
     
     
       4. The light fixture according  claim 1  comprising:
 a guide rail for guiding the light engine module to slide the light engine module towards the mounting wedge. 
 
     
     
       5. The light fixture according to  claim 1  wherein the lens module comprises:
 a ramp section, the latch sliding up the ramp section toward a locked position. 
 
     
     
       6. The light fixture according to  claim 1  wherein the latch comprises:
 a detent falling into a depression in the lens module in a locked position. 
 
     
     
       7. The light fixture according to  claim 1  wherein the latch is a spring loaded cam latch. 
     
     
       8. The light fixture according to  claim 1  wherein at least one of the lens elements is symmetric about a center axis of the at least one lens element. 
     
     
       9. The light fixture according to  claim 1  wherein the mounting wedge is composed by a combination of a solid polymeric base with gasket compounds, the gasket compounds providing compressive forces to the light engine module to hold one end of the light engine module against the housing. 
     
     
       10. The light fixture according to  claim 1  wherein at least one of the lens elements comprises:
 a backlight control structure comprising a parabolic Total Internal Reflection (TIR) surface to collect and redistribute a stray backlight towards a front of the light fixture in a locked position. 
 
     
     
       11. The light fixture according to  claim 1  comprising:
 a cover having pivotably engaged with a bottom of the housing to cover the light engine module. 
 
     
     
       12. The light fixture according to  claim 11  wherein the housing comprises:
 a door latch for locking and unlocking one end of the cover of the housing to allow access to the light engine module. 
 
     
     
       13. A light assembly for a light fixture, comprising:
 a rotatable latch on a housing of the light fixture; 
 a lens module comprising a plurality of lens elements for a plurality of light sources from a light emitting diode (LED) engine and a receiving member for receiving the rotatable latch, the rotatable latch releasably engaged with the receiving member of the lens module to lock and unlock the lens module mounted on the plurality of light sources within the housing by rotation of the latch about an axis perpendicular to the plurality of lens elements of the lens module; and 
 a mounting wedge on the housing opposite the latch within the light fixture, the mounting wedge aligning one end of the lens module and the LED engine with a predetermined position of the housing. 
 
     
     
       14. The light assembly according to  claim 13  comprising:
 a guide rail on the housing for locating the lens module in an installation position of the housing. 
 
     
     
       15. A light engine module and light fixture, comprising:
 a light engine comprising a plurality of light emitting diodes (LED); 
 a rotatable latch on a housing of the light fixture; 
 a mounting wedge provided in the housing of the light fixture; and 
 a lens cover for mating with the light engine, the lens cover having a plurality of lens elements for receiving the plurality of LEDs, the lens cover having a receiving portion on an outside edge for receiving the rotatable latch of the light fixture, the rotatable latch releasably engaged with the receiving portion of the lens cover to lock and unlock the light engine module mounted within the housing by rotation of the latch about an axis perpendicular to the plurality of lens elements of the light engine module and wherein an opposite outside edge portion of the lens cover is substantially flat to engage the mounting wedge to retain the light engine and the lens cover within the light fixture by rotation of the latch to a locking position. 
 
     
     
       16. The light engine module and light fixture of  claim 15  wherein the receiving portion is formed by a recess in the lens cover and light engine module. 
     
     
       17. The light engine module and light fixture of  claim 16  wherein the recess in the lens cover further comprises a depression for receiving a detent of the latch when in a locked position. 
     
     
       18. The light engine module and light fixture of  claim 17  wherein the recess in the lens cover further sliding the latch upon a ramp section in the lens covers toward a locked position prior to the depression for receiving the detent. 
     
     
       19. The light engine module and light fixture of  claim 15  wherein the lens elements of the lens cover further comprise:
 a backlight control structure comprising a parabolic Total Internal Reflection (TIR) surface to collect and redistribute a stray backlight towards a front of the light fixture. 
 
     
     
       20. The light engine module and light fixture of  claim 15  wherein the lens cover is made by a transparent material. 
     
     
       21. The light engine module and light fixture of  claim 20  wherein the transparent material is a Poly(methyl methacrylate) (PMMA) or clear polycarbonate.